Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc9fb0878508177…

MALICIOUS

PDF

90.5 KB Created: 2021-09-02 09:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22dd18a6dd2ee37f635e4b27207d418f SHA-1: 30f260022e8af1ec982c5a231d01c6a283971acf SHA-256: ecc9fb0878508177bdac8aceb54a274f19deb3a56ca1e46ddd0ce2440c1b9706
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for further malicious activity. The embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://europacreativaeuskadi.eu/files/galeria/files/55933779564.pdf In PDF document text
    • http://www.yt333.com/userfiles/20210723/file/1627007514.pdfIn PDF document text
    • http://congluc.com/upload/files/jepafereduwawidusokakug.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/sigilezovizulexoluduti.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/54765485634.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/liboledebumidi.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/tolitafokijus.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/vubikawamudagemegupoj.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/zudowoxifilomab.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/losekibafasasejaloz.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a791d0d9---jusuzitubu.pdfIn PDF document text
    • http://termocity.by/pics/files/depin.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/337951603c6c25822bacac72c676a637/vaxozasuwoxu.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210621_13E212F6D2A98656.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/sowudakexiwefo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6898463be---mavalegometumuze.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/kenejif.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/23948976911.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/wesano.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/levemasupomazavixu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3d69298c---71721702628.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duvopumem.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/tesifijatinopujog.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/sibuwuruzimijabofivuda.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cea4619c72---biravutujapavosefavowez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=real+life+examples+of+linear+relationshipsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 10768 bytes
SHA-256: 943808ff3cd265e0e9b315bcc2f2cbd7a7672d3785df0812dbb6cc93a5a6d5c9
font_01_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3B 18928 bytes
SHA-256: daa5eea1fc6db88f454fabe82bf365883a0f2d453c1126d9037910c04d5f7f7d

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